| 摘要: |
| 信道编码是OFDM系统的关键技术之一，低密度格码（Low Density Lattice Codes, L
DLC）则是一种能高效译码且达到AWGN信道容量的新型编码技术，它兼具格码和低密度奇偶
校验码（Low Density Parity Codes, LDPC）的特点。基于LDLC码编译码原理，给出了LDLC
码作为前向纠错编码技术应用于OFDM系统的方案，在MATLAB平台下仿真研究了LDLC-OFDM系
统
在Rayleigh衰落信道下的性能，结果表明LDLC码很大程度地改善了OFDM系统的误码率性能，
且优于LDPC码。 |
| 关键词: 正交频分复用 信道编码 低密度格码 瑞利衰落 |
| DOI： |
|
| 基金项目:信号与信息处理重庆市市级重点实验室建设项目(CSTC2009CA2
003) |
|
| Application of low density lattice codes in OFDM system and performance simulation |
| GU Wei,ZHU Lian-xiang |
| () |
| Abstract: |
| Channel coding is one of key technologies for OFDM system.Low density
lattice codes(LDLC), which combine the features of lattice codes and low densit
y parity codes(LDPC), are recently-proposed lattice codes that can be decoded ef
ficiently and approach the capacity of the additive white Gaussian noise(AWGN) c
hannel. The basic principles of LDLC are described and the application of LDLC
as a forward error correction coding in OFDM system with Rayleigh fading is res
earched. The performance of LDLC-OFDM system is studied on MATLAB. Simulation r
esults show that the bit error rate(BER) performance of LDLC-OFDM system is sign
ificantly improved compared with OFDM system and better than that of LDPC-OFDM s
ystem. |
| Key words: orthogonal frequency division multiplexing(OFDM) channel coding low density latt
ice code(LDLC) Rayleigh fading |
